No. 1 swimming pool problem? It's number two!

(By Maggie Fox, Senior Writer, NBC News) - People always worry about pee in the pool, but number two is the No. 1 problem, government health experts say. They found plenty of evidence that someone’s pooping in the pool. 

It’s not only disgusting, but it’s evidence that people are not following basic hygiene rules, says Michele Hlavsa, chief of the Centers for Disease Control and Prevention’s Healthy Swimming Program.